 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.ide.misc;

 import org.eclipse.jface.resource.CompositeImageDescriptor;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.swt.graphics.ImageData;
 import org.eclipse.swt.graphics.Point;

 /**
  * An OverlayIcon consists of a main icon and several adornments.
  */
 public class OverlayIcon extends CompositeImageDescriptor {

     static final int DEFAULT_WIDTH = 22;

     static final int DEFAULT_HEIGHT = 16;

     private Point fSize = null;

     private ImageDescriptor fBase;

     private ImageDescriptor fOverlays[][];

     public OverlayIcon(ImageDescriptor base, ImageDescriptor[][] overlays,
             Point size) {
         fBase = base;
         fOverlays = overlays;
         fSize = size;
     }

     protected void drawBottomLeft(ImageDescriptor[] overlays) {
         if (overlays == null) {
             return;
         }
         int length = overlays.length;
         int x = 0;
         for (int i = 0; i < 3; i++) {
             if (i < length && overlays[i] != null) {
                 ImageData id = overlays[i].getImageData();
                 drawImage(id, x, getSize().y - id.height);
                 x += id.width;
             }
         }
     }

     protected void drawBottomRight(ImageDescriptor[] overlays) {
         if (overlays == null) {
             return;
         }
         int length = overlays.length;
         int x = getSize().x;
         for (int i = 2; i >= 0; i--) {
             if (i < length && overlays[i] != null) {
                 ImageData id = overlays[i].getImageData();
                 x -= id.width;
                 drawImage(id, x, getSize().y - id.height);
             }
         }
     }

     /**
      * @see CompositeImageDescriptor#drawCompositeImage(int, int)
      */
     protected void drawCompositeImage(int width, int height) {
         ImageData bg;
         if (fBase == null || (bg = fBase.getImageData()) == null) {
             bg = DEFAULT_IMAGE_DATA;
         }
         drawImage(bg, 0, 0);

         if (fOverlays != null) {
             if (fOverlays.length > 0) {
                 drawTopRight(fOverlays[0]);
             }

             if (fOverlays.length > 1) {
                 drawBottomRight(fOverlays[1]);
             }

             if (fOverlays.length > 2) {
                 drawBottomLeft(fOverlays[2]);
             }

             if (fOverlays.length > 3) {
                 drawTopLeft(fOverlays[3]);
             }
         }
     }

     protected void drawTopLeft(ImageDescriptor[] overlays) {
         if (overlays == null) {
             return;
         }
         int length = overlays.length;
         int x = 0;
         for (int i = 0; i < 3; i++) {
             if (i < length && overlays[i] != null) {
                 ImageData id = overlays[i].getImageData();
                 drawImage(id, x, 0);
                 x += id.width;
             }
         }
     }

     protected void drawTopRight(ImageDescriptor[] overlays) {
         if (overlays == null) {
             return;
         }
         int length = overlays.length;
         int x = getSize().x;
         for (int i = 2; i >= 0; i--) {
             if (i < length && overlays[i] != null) {
                 ImageData id = overlays[i].getImageData();
                 x -= id.width;
                 drawImage(id, x, 0);
             }
         }
     }

     /**
      * @see CompositeImageDescriptor#getSize()
      */
     protected Point getSize() {
         return fSize;
     }
 }

